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Rev | Author | Line No. | Line |
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6148 | serge | 1 | /* |
2 | * MPEG1/2 muxer |
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3 | * Copyright (c) 2000, 2001, 2002 Fabrice Bellard |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include "libavutil/attributes.h" |
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23 | #include "libavutil/fifo.h" |
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24 | #include "libavutil/log.h" |
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25 | #include "libavutil/mathematics.h" |
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26 | #include "libavutil/opt.h" |
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27 | #include "libavcodec/put_bits.h" |
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28 | #include "avformat.h" |
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29 | #include "internal.h" |
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30 | #include "mpeg.h" |
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31 | |||
32 | #define MAX_PAYLOAD_SIZE 4096 |
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33 | |||
34 | #undef NDEBUG |
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35 | #include |
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36 | |||
37 | typedef struct PacketDesc { |
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38 | int64_t pts; |
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39 | int64_t dts; |
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40 | int size; |
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41 | int unwritten_size; |
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42 | int flags; |
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43 | struct PacketDesc *next; |
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44 | } PacketDesc; |
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45 | |||
46 | typedef struct { |
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47 | AVFifoBuffer *fifo; |
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48 | uint8_t id; |
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49 | int max_buffer_size; /* in bytes */ |
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50 | int buffer_index; |
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51 | PacketDesc *predecode_packet; |
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52 | PacketDesc *premux_packet; |
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53 | PacketDesc **next_packet; |
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54 | int packet_number; |
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55 | uint8_t lpcm_header[3]; |
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56 | int lpcm_align; |
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57 | int bytes_to_iframe; |
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58 | int align_iframe; |
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59 | int64_t vobu_start_pts; |
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60 | } StreamInfo; |
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61 | |||
62 | typedef struct { |
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63 | const AVClass *class; |
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64 | int packet_size; /* required packet size */ |
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65 | int packet_number; |
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66 | int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */ |
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67 | int system_header_freq; |
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68 | int system_header_size; |
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69 | int user_mux_rate; /* bitrate in units of bits/s */ |
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70 | int mux_rate; /* bitrate in units of 50 bytes/s */ |
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71 | /* stream info */ |
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72 | int audio_bound; |
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73 | int video_bound; |
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74 | int is_mpeg2; |
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75 | int is_vcd; |
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76 | int is_svcd; |
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77 | int is_dvd; |
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78 | int64_t last_scr; /* current system clock */ |
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79 | |||
80 | double vcd_padding_bitrate; //FIXME floats |
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81 | int64_t vcd_padding_bytes_written; |
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82 | |||
83 | int preload; |
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84 | } MpegMuxContext; |
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85 | |||
86 | extern AVOutputFormat ff_mpeg1vcd_muxer; |
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87 | extern AVOutputFormat ff_mpeg2dvd_muxer; |
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88 | extern AVOutputFormat ff_mpeg2svcd_muxer; |
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89 | extern AVOutputFormat ff_mpeg2vob_muxer; |
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90 | |||
91 | static int put_pack_header(AVFormatContext *ctx, |
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92 | uint8_t *buf, int64_t timestamp) |
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93 | { |
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94 | MpegMuxContext *s = ctx->priv_data; |
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95 | PutBitContext pb; |
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96 | |||
97 | init_put_bits(&pb, buf, 128); |
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98 | |||
99 | put_bits32(&pb, PACK_START_CODE); |
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100 | if (s->is_mpeg2) { |
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101 | put_bits(&pb, 2, 0x1); |
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102 | } else { |
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103 | put_bits(&pb, 4, 0x2); |
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104 | } |
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105 | put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07)); |
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106 | put_bits(&pb, 1, 1); |
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107 | put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff)); |
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108 | put_bits(&pb, 1, 1); |
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109 | put_bits(&pb, 15, (uint32_t)((timestamp ) & 0x7fff)); |
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110 | put_bits(&pb, 1, 1); |
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111 | if (s->is_mpeg2) { |
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112 | /* clock extension */ |
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113 | put_bits(&pb, 9, 0); |
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114 | } |
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115 | put_bits(&pb, 1, 1); |
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116 | put_bits(&pb, 22, s->mux_rate); |
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117 | put_bits(&pb, 1, 1); |
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118 | if (s->is_mpeg2) { |
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119 | put_bits(&pb, 1, 1); |
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120 | put_bits(&pb, 5, 0x1f); /* reserved */ |
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121 | put_bits(&pb, 3, 0); /* stuffing length */ |
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122 | } |
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123 | flush_put_bits(&pb); |
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124 | return put_bits_ptr(&pb) - pb.buf; |
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125 | } |
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126 | |||
127 | static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id) |
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128 | { |
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129 | MpegMuxContext *s = ctx->priv_data; |
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130 | int size, i, private_stream_coded, id; |
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131 | PutBitContext pb; |
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132 | |||
133 | init_put_bits(&pb, buf, 128); |
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134 | |||
135 | put_bits32(&pb, SYSTEM_HEADER_START_CODE); |
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136 | put_bits(&pb, 16, 0); |
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137 | put_bits(&pb, 1, 1); |
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138 | |||
139 | put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */ |
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140 | put_bits(&pb, 1, 1); /* marker */ |
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141 | if (s->is_vcd && only_for_stream_id==VIDEO_ID) { |
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142 | /* This header applies only to the video stream (see VCD standard p. IV-7)*/ |
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143 | put_bits(&pb, 6, 0); |
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144 | } else |
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145 | put_bits(&pb, 6, s->audio_bound); |
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146 | |||
147 | if (s->is_vcd) { |
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148 | /* see VCD standard, p. IV-7*/ |
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149 | put_bits(&pb, 1, 0); |
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150 | put_bits(&pb, 1, 1); |
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151 | } else { |
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152 | put_bits(&pb, 1, 0); /* variable bitrate*/ |
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153 | put_bits(&pb, 1, 0); /* non constrainted bit stream */ |
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154 | } |
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155 | |||
156 | if (s->is_vcd || s->is_dvd) { |
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157 | /* see VCD standard p IV-7 */ |
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158 | put_bits(&pb, 1, 1); /* audio locked */ |
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159 | put_bits(&pb, 1, 1); /* video locked */ |
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160 | } else { |
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161 | put_bits(&pb, 1, 0); /* audio locked */ |
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162 | put_bits(&pb, 1, 0); /* video locked */ |
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163 | } |
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164 | |||
165 | put_bits(&pb, 1, 1); /* marker */ |
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166 | |||
167 | if (s->is_vcd && (only_for_stream_id & 0xe0) == AUDIO_ID) { |
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168 | /* This header applies only to the audio stream (see VCD standard p. IV-7)*/ |
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169 | put_bits(&pb, 5, 0); |
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170 | } else |
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171 | put_bits(&pb, 5, s->video_bound); |
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172 | |||
173 | if (s->is_dvd) { |
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174 | put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */ |
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175 | put_bits(&pb, 7, 0x7f); /* reserved byte */ |
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176 | } else |
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177 | put_bits(&pb, 8, 0xff); /* reserved byte */ |
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178 | |||
179 | /* DVD-Video Stream_bound entries |
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180 | id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1) |
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181 | id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0) |
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182 | id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1) |
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183 | id (0xBF) private stream 2, NAV packs, set to 2x1024. */ |
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184 | if (s->is_dvd) { |
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185 | |||
186 | int P_STD_max_video = 0; |
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187 | int P_STD_max_mpeg_audio = 0; |
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188 | int P_STD_max_mpeg_PS1 = 0; |
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189 | |||
190 | for(i=0;i |
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191 | StreamInfo *stream = ctx->streams[i]->priv_data; |
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192 | |||
193 | id = stream->id; |
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194 | if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) { |
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195 | P_STD_max_mpeg_PS1 = stream->max_buffer_size; |
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196 | } else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) { |
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197 | P_STD_max_mpeg_audio = stream->max_buffer_size; |
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198 | } else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) { |
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199 | P_STD_max_video = stream->max_buffer_size; |
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200 | } |
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201 | } |
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202 | |||
203 | /* video */ |
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204 | put_bits(&pb, 8, 0xb9); /* stream ID */ |
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205 | put_bits(&pb, 2, 3); |
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206 | put_bits(&pb, 1, 1); |
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207 | put_bits(&pb, 13, P_STD_max_video / 1024); |
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208 | |||
209 | /* audio */ |
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210 | if (P_STD_max_mpeg_audio == 0) |
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211 | P_STD_max_mpeg_audio = 4096; |
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212 | put_bits(&pb, 8, 0xb8); /* stream ID */ |
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213 | put_bits(&pb, 2, 3); |
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214 | put_bits(&pb, 1, 0); |
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215 | put_bits(&pb, 13, P_STD_max_mpeg_audio / 128); |
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216 | |||
217 | /* private stream 1 */ |
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218 | put_bits(&pb, 8, 0xbd); /* stream ID */ |
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219 | put_bits(&pb, 2, 3); |
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220 | put_bits(&pb, 1, 0); |
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221 | put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128); |
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222 | |||
223 | /* private stream 2 */ |
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224 | put_bits(&pb, 8, 0xbf); /* stream ID */ |
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225 | put_bits(&pb, 2, 3); |
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226 | put_bits(&pb, 1, 1); |
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227 | put_bits(&pb, 13, 2); |
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228 | } |
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229 | else { |
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230 | /* audio stream info */ |
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231 | private_stream_coded = 0; |
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232 | for(i=0;i |
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233 | StreamInfo *stream = ctx->streams[i]->priv_data; |
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234 | |||
235 | |||
236 | /* For VCDs, only include the stream info for the stream |
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237 | that the pack which contains this system belongs to. |
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238 | (see VCD standard p. IV-7) */ |
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239 | if ( !s->is_vcd || stream->id==only_for_stream_id |
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240 | || only_for_stream_id==0) { |
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241 | |||
242 | id = stream->id; |
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243 | if (id < 0xc0) { |
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244 | /* special case for private streams (AC-3 uses that) */ |
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245 | if (private_stream_coded) |
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246 | continue; |
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247 | private_stream_coded = 1; |
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248 | id = 0xbd; |
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249 | } |
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250 | put_bits(&pb, 8, id); /* stream ID */ |
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251 | put_bits(&pb, 2, 3); |
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252 | if (id < 0xe0) { |
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253 | /* audio */ |
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254 | put_bits(&pb, 1, 0); |
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255 | put_bits(&pb, 13, stream->max_buffer_size / 128); |
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256 | } else { |
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257 | /* video */ |
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258 | put_bits(&pb, 1, 1); |
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259 | put_bits(&pb, 13, stream->max_buffer_size / 1024); |
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260 | } |
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261 | } |
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262 | } |
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263 | } |
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264 | |||
265 | flush_put_bits(&pb); |
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266 | size = put_bits_ptr(&pb) - pb.buf; |
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267 | /* patch packet size */ |
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268 | AV_WB16(buf + 4, size - 6); |
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269 | |||
270 | return size; |
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271 | } |
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272 | |||
273 | static int get_system_header_size(AVFormatContext *ctx) |
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274 | { |
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275 | int buf_index, i, private_stream_coded; |
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276 | StreamInfo *stream; |
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277 | MpegMuxContext *s = ctx->priv_data; |
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278 | |||
279 | if (s->is_dvd) |
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280 | return 18; // DVD-Video system headers are 18 bytes fixed length. |
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281 | |||
282 | buf_index = 12; |
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283 | private_stream_coded = 0; |
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284 | for(i=0;i |
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285 | stream = ctx->streams[i]->priv_data; |
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286 | if (stream->id < 0xc0) { |
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287 | if (private_stream_coded) |
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288 | continue; |
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289 | private_stream_coded = 1; |
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290 | } |
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291 | buf_index += 3; |
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292 | } |
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293 | return buf_index; |
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294 | } |
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295 | |||
296 | static av_cold int mpeg_mux_init(AVFormatContext *ctx) |
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297 | { |
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298 | MpegMuxContext *s = ctx->priv_data; |
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299 | int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j; |
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300 | AVStream *st; |
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301 | StreamInfo *stream; |
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302 | int audio_bitrate; |
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303 | int video_bitrate; |
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304 | |||
305 | s->packet_number = 0; |
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306 | s->is_vcd = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer); |
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307 | s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer); |
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308 | s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) || |
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309 | (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) || |
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310 | (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer)); |
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311 | s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer); |
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312 | |||
313 | if(ctx->packet_size) { |
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314 | if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) { |
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315 | av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n", |
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316 | ctx->packet_size); |
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317 | goto fail; |
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318 | } |
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319 | s->packet_size = ctx->packet_size; |
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320 | } else |
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321 | s->packet_size = 2048; |
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322 | if (ctx->max_delay < 0) /* Not set by the caller */ |
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323 | ctx->max_delay = 0.7*AV_TIME_BASE; |
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324 | |||
325 | s->vcd_padding_bytes_written = 0; |
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326 | s->vcd_padding_bitrate=0; |
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327 | |||
328 | s->audio_bound = 0; |
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329 | s->video_bound = 0; |
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330 | mpa_id = AUDIO_ID; |
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331 | ac3_id = AC3_ID; |
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332 | dts_id = DTS_ID; |
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333 | mpv_id = VIDEO_ID; |
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334 | mps_id = SUB_ID; |
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335 | lpcm_id = LPCM_ID; |
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336 | for(i=0;i |
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337 | st = ctx->streams[i]; |
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338 | stream = av_mallocz(sizeof(StreamInfo)); |
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339 | if (!stream) |
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340 | goto fail; |
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341 | st->priv_data = stream; |
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342 | |||
343 | avpriv_set_pts_info(st, 64, 1, 90000); |
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344 | |||
345 | switch(st->codec->codec_type) { |
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346 | case AVMEDIA_TYPE_AUDIO: |
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347 | if (st->codec->codec_id == AV_CODEC_ID_AC3) { |
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348 | stream->id = ac3_id++; |
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349 | } else if (st->codec->codec_id == AV_CODEC_ID_DTS) { |
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350 | stream->id = dts_id++; |
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351 | } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) { |
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352 | stream->id = lpcm_id++; |
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353 | for(j = 0; j < 4; j++) { |
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354 | if (lpcm_freq_tab[j] == st->codec->sample_rate) |
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355 | break; |
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356 | } |
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357 | if (j == 4) |
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358 | goto fail; |
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359 | if (st->codec->channels > 8) |
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360 | return -1; |
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361 | stream->lpcm_header[0] = 0x0c; |
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362 | stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4); |
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363 | stream->lpcm_header[2] = 0x80; |
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364 | stream->lpcm_align = st->codec->channels * 2; |
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365 | } else { |
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366 | stream->id = mpa_id++; |
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367 | } |
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368 | |||
369 | /* This value HAS to be used for VCD (see VCD standard, p. IV-7). |
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370 | Right now it is also used for everything else.*/ |
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371 | stream->max_buffer_size = 4 * 1024; |
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372 | s->audio_bound++; |
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373 | break; |
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374 | case AVMEDIA_TYPE_VIDEO: |
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375 | stream->id = mpv_id++; |
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376 | if (st->codec->rc_buffer_size) |
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377 | stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8; |
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378 | else { |
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379 | av_log(ctx, AV_LOG_WARNING, "VBV buffer size not set, muxing may fail\n"); |
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380 | stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default |
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381 | } |
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382 | if (stream->max_buffer_size > 1024 * 8191) { |
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383 | av_log(ctx, AV_LOG_WARNING, "buffer size %d, too large\n", stream->max_buffer_size); |
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384 | stream->max_buffer_size = 1024 * 8191; |
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385 | } |
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386 | s->video_bound++; |
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387 | break; |
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388 | case AVMEDIA_TYPE_SUBTITLE: |
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389 | stream->id = mps_id++; |
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390 | stream->max_buffer_size = 16 * 1024; |
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391 | break; |
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392 | default: |
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393 | return -1; |
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394 | } |
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395 | stream->fifo= av_fifo_alloc(16); |
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396 | if (!stream->fifo) |
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397 | goto fail; |
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398 | } |
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399 | bitrate = 0; |
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400 | audio_bitrate = 0; |
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401 | video_bitrate = 0; |
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402 | for(i=0;i |
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403 | int codec_rate; |
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404 | st = ctx->streams[i]; |
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405 | stream = (StreamInfo*) st->priv_data; |
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406 | |||
407 | if(st->codec->rc_max_rate || stream->id==VIDEO_ID) |
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408 | codec_rate= st->codec->rc_max_rate; |
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409 | else |
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410 | codec_rate= st->codec->bit_rate; |
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411 | |||
412 | if(!codec_rate) |
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413 | codec_rate= (1<<21)*8*50/ctx->nb_streams; |
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414 | |||
415 | bitrate += codec_rate; |
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416 | |||
417 | if ((stream->id & 0xe0) == AUDIO_ID) |
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418 | audio_bitrate += codec_rate; |
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419 | else if (stream->id==VIDEO_ID) |
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420 | video_bitrate += codec_rate; |
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421 | } |
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422 | |||
423 | if (s->user_mux_rate) { |
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424 | s->mux_rate = (s->user_mux_rate + (8 * 50) - 1) / (8 * 50); |
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425 | } else { |
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426 | /* we increase slightly the bitrate to take into account the |
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427 | headers. XXX: compute it exactly */ |
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428 | bitrate += bitrate / 20; |
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429 | bitrate += 10000; |
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430 | s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50); |
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431 | if (s->mux_rate >= (1<<22)) { |
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432 | av_log(ctx, AV_LOG_WARNING, "mux rate %d is too large\n", s->mux_rate); |
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433 | s->mux_rate = (1<<22) - 1; |
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434 | } |
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435 | } |
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436 | |||
437 | if (s->is_vcd) { |
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438 | double overhead_rate; |
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439 | |||
440 | /* The VCD standard mandates that the mux_rate field is 3528 |
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441 | (see standard p. IV-6). |
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442 | The value is actually "wrong", i.e. if you calculate |
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443 | it using the normal formula and the 75 sectors per second transfer |
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444 | rate you get a different value because the real pack size is 2324, |
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445 | not 2352. But the standard explicitly specifies that the mux_rate |
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446 | field in the header must have this value.*/ |
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447 | // s->mux_rate=2352 * 75 / 50; /* = 3528*/ |
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448 | |||
449 | /* The VCD standard states that the muxed stream must be |
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450 | exactly 75 packs / second (the data rate of a single speed cdrom). |
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451 | Since the video bitrate (probably 1150000 bits/sec) will be below |
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452 | the theoretical maximum we have to add some padding packets |
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453 | to make up for the lower data rate. |
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454 | (cf. VCD standard p. IV-6 )*/ |
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455 | |||
456 | /* Add the header overhead to the data rate. |
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457 | 2279 data bytes per audio pack, 2294 data bytes per video pack*/ |
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458 | overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279); |
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459 | overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294); |
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460 | overhead_rate *= 8; |
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461 | |||
462 | /* Add padding so that the full bitrate is 2324*75 bytes/sec */ |
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463 | s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate); |
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464 | } |
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465 | |||
466 | if (s->is_vcd || s->is_mpeg2) |
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467 | /* every packet */ |
||
468 | s->pack_header_freq = 1; |
||
469 | else |
||
470 | /* every 2 seconds */ |
||
471 | s->pack_header_freq = 2 * bitrate / s->packet_size / 8; |
||
472 | |||
473 | /* the above seems to make pack_header_freq zero sometimes */ |
||
474 | if (s->pack_header_freq == 0) |
||
475 | s->pack_header_freq = 1; |
||
476 | |||
477 | if (s->is_mpeg2) |
||
478 | /* every 200 packets. Need to look at the spec. */ |
||
479 | s->system_header_freq = s->pack_header_freq * 40; |
||
480 | else if (s->is_vcd) |
||
481 | /* the standard mandates that there are only two system headers |
||
482 | in the whole file: one in the first packet of each stream. |
||
483 | (see standard p. IV-7 and IV-8) */ |
||
484 | s->system_header_freq = 0x7fffffff; |
||
485 | else |
||
486 | s->system_header_freq = s->pack_header_freq * 5; |
||
487 | |||
488 | for(i=0;i |
||
489 | stream = ctx->streams[i]->priv_data; |
||
490 | stream->packet_number = 0; |
||
491 | } |
||
492 | s->system_header_size = get_system_header_size(ctx); |
||
493 | s->last_scr = AV_NOPTS_VALUE; |
||
494 | return 0; |
||
495 | fail: |
||
496 | for(i=0;i |
||
497 | av_free(ctx->streams[i]->priv_data); |
||
498 | } |
||
499 | return AVERROR(ENOMEM); |
||
500 | } |
||
501 | |||
502 | static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp) |
||
503 | { |
||
504 | avio_w8(pb, |
||
505 | (id << 4) | |
||
506 | (((timestamp >> 30) & 0x07) << 1) | |
||
507 | 1); |
||
508 | avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1)); |
||
509 | avio_wb16(pb, (uint16_t)((((timestamp ) & 0x7fff) << 1) | 1)); |
||
510 | } |
||
511 | |||
512 | |||
513 | /* return the number of padding bytes that should be inserted into |
||
514 | the multiplexed stream.*/ |
||
515 | static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts) |
||
516 | { |
||
517 | MpegMuxContext *s = ctx->priv_data; |
||
518 | int pad_bytes = 0; |
||
519 | |||
520 | if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE) |
||
521 | { |
||
522 | int64_t full_pad_bytes; |
||
523 | |||
524 | full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong |
||
525 | pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written); |
||
526 | |||
527 | if (pad_bytes<0) |
||
528 | /* might happen if we have already padded to a later timestamp. This |
||
529 | can occur if another stream has already advanced further.*/ |
||
530 | pad_bytes=0; |
||
531 | } |
||
532 | |||
533 | return pad_bytes; |
||
534 | } |
||
535 | |||
536 | |||
537 | /* Write an MPEG padding packet header. */ |
||
538 | static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,int packet_bytes) |
||
539 | { |
||
540 | MpegMuxContext *s = ctx->priv_data; |
||
541 | int i; |
||
542 | |||
543 | avio_wb32(pb, PADDING_STREAM); |
||
544 | avio_wb16(pb, packet_bytes - 6); |
||
545 | if (!s->is_mpeg2) { |
||
546 | avio_w8(pb, 0x0f); |
||
547 | packet_bytes -= 7; |
||
548 | } else |
||
549 | packet_bytes -= 6; |
||
550 | |||
551 | for(i=0;i |
||
552 | avio_w8(pb, 0xff); |
||
553 | } |
||
554 | |||
555 | static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){ |
||
556 | int nb_frames=0; |
||
557 | PacketDesc *pkt_desc= stream->premux_packet; |
||
558 | |||
559 | while(len>0){ |
||
560 | if(pkt_desc->size == pkt_desc->unwritten_size) |
||
561 | nb_frames++; |
||
562 | len -= pkt_desc->unwritten_size; |
||
563 | pkt_desc= pkt_desc->next; |
||
564 | } |
||
565 | |||
566 | return nb_frames; |
||
567 | } |
||
568 | |||
569 | /* flush the packet on stream stream_index */ |
||
570 | static int flush_packet(AVFormatContext *ctx, int stream_index, |
||
571 | int64_t pts, int64_t dts, int64_t scr, int trailer_size) |
||
572 | { |
||
573 | MpegMuxContext *s = ctx->priv_data; |
||
574 | StreamInfo *stream = ctx->streams[stream_index]->priv_data; |
||
575 | uint8_t *buf_ptr; |
||
576 | int size, payload_size, startcode, id, stuffing_size, i, header_len; |
||
577 | int packet_size; |
||
578 | uint8_t buffer[128]; |
||
579 | int zero_trail_bytes = 0; |
||
580 | int pad_packet_bytes = 0; |
||
581 | int pes_flags; |
||
582 | int general_pack = 0; /*"general" pack without data specific to one stream?*/ |
||
583 | int nb_frames; |
||
584 | |||
585 | id = stream->id; |
||
586 | |||
587 | av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0); |
||
588 | |||
589 | buf_ptr = buffer; |
||
590 | |||
591 | if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) { |
||
592 | /* output pack and systems header if needed */ |
||
593 | size = put_pack_header(ctx, buf_ptr, scr); |
||
594 | buf_ptr += size; |
||
595 | s->last_scr= scr; |
||
596 | |||
597 | if (s->is_vcd) { |
||
598 | /* there is exactly one system header for each stream in a VCD MPEG, |
||
599 | One in the very first video packet and one in the very first |
||
600 | audio packet (see VCD standard p. IV-7 and IV-8).*/ |
||
601 | |||
602 | if (stream->packet_number==0) { |
||
603 | size = put_system_header(ctx, buf_ptr, id); |
||
604 | buf_ptr += size; |
||
605 | } |
||
606 | } else if (s->is_dvd) { |
||
607 | if (stream->align_iframe || s->packet_number == 0){ |
||
608 | int PES_bytes_to_fill = s->packet_size - size - 10; |
||
609 | |||
610 | if (pts != AV_NOPTS_VALUE) { |
||
611 | if (dts != pts) |
||
612 | PES_bytes_to_fill -= 5 + 5; |
||
613 | else |
||
614 | PES_bytes_to_fill -= 5; |
||
615 | } |
||
616 | |||
617 | if (stream->bytes_to_iframe == 0 || s->packet_number == 0) { |
||
618 | size = put_system_header(ctx, buf_ptr, 0); |
||
619 | buf_ptr += size; |
||
620 | size = buf_ptr - buffer; |
||
621 | avio_write(ctx->pb, buffer, size); |
||
622 | |||
623 | avio_wb32(ctx->pb, PRIVATE_STREAM_2); |
||
624 | avio_wb16(ctx->pb, 0x03d4); // length |
||
625 | avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI |
||
626 | for (i = 0; i < 979; i++) |
||
627 | avio_w8(ctx->pb, 0x00); |
||
628 | |||
629 | avio_wb32(ctx->pb, PRIVATE_STREAM_2); |
||
630 | avio_wb16(ctx->pb, 0x03fa); // length |
||
631 | avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI |
||
632 | for (i = 0; i < 1017; i++) |
||
633 | avio_w8(ctx->pb, 0x00); |
||
634 | |||
635 | memset(buffer, 0, 128); |
||
636 | buf_ptr = buffer; |
||
637 | s->packet_number++; |
||
638 | stream->align_iframe = 0; |
||
639 | scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet |
||
640 | size = put_pack_header(ctx, buf_ptr, scr); |
||
641 | s->last_scr= scr; |
||
642 | buf_ptr += size; |
||
643 | /* GOP Start */ |
||
644 | } else if (stream->bytes_to_iframe < PES_bytes_to_fill) { |
||
645 | pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe; |
||
646 | } |
||
647 | } |
||
648 | } else { |
||
649 | if ((s->packet_number % s->system_header_freq) == 0) { |
||
650 | size = put_system_header(ctx, buf_ptr, 0); |
||
651 | buf_ptr += size; |
||
652 | } |
||
653 | } |
||
654 | } |
||
655 | size = buf_ptr - buffer; |
||
656 | avio_write(ctx->pb, buffer, size); |
||
657 | |||
658 | packet_size = s->packet_size - size; |
||
659 | |||
660 | if (s->is_vcd && (id & 0xe0) == AUDIO_ID) |
||
661 | /* The VCD standard demands that 20 zero bytes follow |
||
662 | each audio pack (see standard p. IV-8).*/ |
||
663 | zero_trail_bytes += 20; |
||
664 | |||
665 | if ((s->is_vcd && stream->packet_number==0) |
||
666 | || (s->is_svcd && s->packet_number==0)) { |
||
667 | /* for VCD the first pack of each stream contains only the pack header, |
||
668 | the system header and lots of padding (see VCD standard p. IV-6). |
||
669 | In the case of an audio pack, 20 zero bytes are also added at |
||
670 | the end.*/ |
||
671 | /* For SVCD we fill the very first pack to increase compatibility with |
||
672 | some DVD players. Not mandated by the standard.*/ |
||
673 | if (s->is_svcd) |
||
674 | general_pack = 1; /* the system header refers to both streams and no stream data*/ |
||
675 | pad_packet_bytes = packet_size - zero_trail_bytes; |
||
676 | } |
||
677 | |||
678 | packet_size -= pad_packet_bytes + zero_trail_bytes; |
||
679 | |||
680 | if (packet_size > 0) { |
||
681 | |||
682 | /* packet header size */ |
||
683 | packet_size -= 6; |
||
684 | |||
685 | /* packet header */ |
||
686 | if (s->is_mpeg2) { |
||
687 | header_len = 3; |
||
688 | if (stream->packet_number==0) |
||
689 | header_len += 3; /* PES extension */ |
||
690 | header_len += 1; /* obligatory stuffing byte */ |
||
691 | } else { |
||
692 | header_len = 0; |
||
693 | } |
||
694 | if (pts != AV_NOPTS_VALUE) { |
||
695 | if (dts != pts) |
||
696 | header_len += 5 + 5; |
||
697 | else |
||
698 | header_len += 5; |
||
699 | } else { |
||
700 | if (!s->is_mpeg2) |
||
701 | header_len++; |
||
702 | } |
||
703 | |||
704 | payload_size = packet_size - header_len; |
||
705 | if (id < 0xc0) { |
||
706 | startcode = PRIVATE_STREAM_1; |
||
707 | payload_size -= 1; |
||
708 | if (id >= 0x40) { |
||
709 | payload_size -= 3; |
||
710 | if (id >= 0xa0) |
||
711 | payload_size -= 3; |
||
712 | } |
||
713 | } else { |
||
714 | startcode = 0x100 + id; |
||
715 | } |
||
716 | |||
717 | stuffing_size = payload_size - av_fifo_size(stream->fifo); |
||
718 | |||
719 | // first byte does not fit -> reset pts/dts + stuffing |
||
720 | if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){ |
||
721 | int timestamp_len=0; |
||
722 | if(dts != pts) |
||
723 | timestamp_len += 5; |
||
724 | if(pts != AV_NOPTS_VALUE) |
||
725 | timestamp_len += s->is_mpeg2 ? 5 : 4; |
||
726 | pts=dts= AV_NOPTS_VALUE; |
||
727 | header_len -= timestamp_len; |
||
728 | if (s->is_dvd && stream->align_iframe) { |
||
729 | pad_packet_bytes += timestamp_len; |
||
730 | packet_size -= timestamp_len; |
||
731 | } else { |
||
732 | payload_size += timestamp_len; |
||
733 | } |
||
734 | stuffing_size += timestamp_len; |
||
735 | if(payload_size > trailer_size) |
||
736 | stuffing_size += payload_size - trailer_size; |
||
737 | } |
||
738 | |||
739 | if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing |
||
740 | packet_size += pad_packet_bytes; |
||
741 | payload_size += pad_packet_bytes; // undo the previous adjustment |
||
742 | if (stuffing_size < 0) { |
||
743 | stuffing_size = pad_packet_bytes; |
||
744 | } else { |
||
745 | stuffing_size += pad_packet_bytes; |
||
746 | } |
||
747 | pad_packet_bytes = 0; |
||
748 | } |
||
749 | |||
750 | if (stuffing_size < 0) |
||
751 | stuffing_size = 0; |
||
752 | |||
753 | if (startcode == PRIVATE_STREAM_1 && id >= 0xa0) { |
||
754 | if (payload_size < av_fifo_size(stream->fifo)) |
||
755 | stuffing_size += payload_size % stream->lpcm_align; |
||
756 | } |
||
757 | |||
758 | if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/ |
||
759 | pad_packet_bytes += stuffing_size; |
||
760 | packet_size -= stuffing_size; |
||
761 | payload_size -= stuffing_size; |
||
762 | stuffing_size = 0; |
||
763 | } |
||
764 | |||
765 | nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size); |
||
766 | |||
767 | avio_wb32(ctx->pb, startcode); |
||
768 | |||
769 | avio_wb16(ctx->pb, packet_size); |
||
770 | |||
771 | if (!s->is_mpeg2) |
||
772 | for(i=0;i |
||
773 | avio_w8(ctx->pb, 0xff); |
||
774 | |||
775 | if (s->is_mpeg2) { |
||
776 | avio_w8(ctx->pb, 0x80); /* mpeg2 id */ |
||
777 | |||
778 | pes_flags=0; |
||
779 | |||
780 | if (pts != AV_NOPTS_VALUE) { |
||
781 | pes_flags |= 0x80; |
||
782 | if (dts != pts) |
||
783 | pes_flags |= 0x40; |
||
784 | } |
||
785 | |||
786 | /* Both the MPEG-2 and the SVCD standards demand that the |
||
787 | P-STD_buffer_size field be included in the first packet of |
||
788 | every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2 |
||
789 | and MPEG-2 standard 2.7.7) */ |
||
790 | if (stream->packet_number == 0) |
||
791 | pes_flags |= 0x01; |
||
792 | |||
793 | avio_w8(ctx->pb, pes_flags); /* flags */ |
||
794 | avio_w8(ctx->pb, header_len - 3 + stuffing_size); |
||
795 | |||
796 | if (pes_flags & 0x80) /*write pts*/ |
||
797 | put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts); |
||
798 | if (pes_flags & 0x40) /*write dts*/ |
||
799 | put_timestamp(ctx->pb, 0x01, dts); |
||
800 | |||
801 | if (pes_flags & 0x01) { /*write pes extension*/ |
||
802 | avio_w8(ctx->pb, 0x10); /* flags */ |
||
803 | |||
804 | /* P-STD buffer info */ |
||
805 | if ((id & 0xe0) == AUDIO_ID) |
||
806 | avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128); |
||
807 | else |
||
808 | avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size/1024); |
||
809 | } |
||
810 | |||
811 | } else { |
||
812 | if (pts != AV_NOPTS_VALUE) { |
||
813 | if (dts != pts) { |
||
814 | put_timestamp(ctx->pb, 0x03, pts); |
||
815 | put_timestamp(ctx->pb, 0x01, dts); |
||
816 | } else { |
||
817 | put_timestamp(ctx->pb, 0x02, pts); |
||
818 | } |
||
819 | } else { |
||
820 | avio_w8(ctx->pb, 0x0f); |
||
821 | } |
||
822 | } |
||
823 | |||
824 | if (s->is_mpeg2) { |
||
825 | /* special stuffing byte that is always written |
||
826 | to prevent accidental generation of start codes. */ |
||
827 | avio_w8(ctx->pb, 0xff); |
||
828 | |||
829 | for(i=0;i |
||
830 | avio_w8(ctx->pb, 0xff); |
||
831 | } |
||
832 | |||
833 | if (startcode == PRIVATE_STREAM_1) { |
||
834 | avio_w8(ctx->pb, id); |
||
835 | if (id >= 0xa0) { |
||
836 | /* LPCM (XXX: check nb_frames) */ |
||
837 | avio_w8(ctx->pb, 7); |
||
838 | avio_wb16(ctx->pb, 4); /* skip 3 header bytes */ |
||
839 | avio_w8(ctx->pb, stream->lpcm_header[0]); |
||
840 | avio_w8(ctx->pb, stream->lpcm_header[1]); |
||
841 | avio_w8(ctx->pb, stream->lpcm_header[2]); |
||
842 | } else if (id >= 0x40) { |
||
843 | /* AC-3 */ |
||
844 | avio_w8(ctx->pb, nb_frames); |
||
845 | avio_wb16(ctx->pb, trailer_size+1); |
||
846 | } |
||
847 | } |
||
848 | |||
849 | /* output data */ |
||
850 | assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo)); |
||
851 | av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, (void*)avio_write); |
||
852 | stream->bytes_to_iframe -= payload_size - stuffing_size; |
||
853 | }else{ |
||
854 | payload_size= |
||
855 | stuffing_size= 0; |
||
856 | } |
||
857 | |||
858 | if (pad_packet_bytes > 0) |
||
859 | put_padding_packet(ctx,ctx->pb, pad_packet_bytes); |
||
860 | |||
861 | for(i=0;i |
||
862 | avio_w8(ctx->pb, 0x00); |
||
863 | |||
864 | avio_flush(ctx->pb); |
||
865 | |||
866 | s->packet_number++; |
||
867 | |||
868 | /* only increase the stream packet number if this pack actually contains |
||
869 | something that is specific to this stream! I.e. a dedicated header |
||
870 | or some data.*/ |
||
871 | if (!general_pack) |
||
872 | stream->packet_number++; |
||
873 | |||
874 | return payload_size - stuffing_size; |
||
875 | } |
||
876 | |||
877 | static void put_vcd_padding_sector(AVFormatContext *ctx) |
||
878 | { |
||
879 | /* There are two ways to do this padding: writing a sector/pack |
||
880 | of 0 values, or writing an MPEG padding pack. Both seem to |
||
881 | work with most decoders, BUT the VCD standard only allows a 0-sector |
||
882 | (see standard p. IV-4, IV-5). |
||
883 | So a 0-sector it is...*/ |
||
884 | |||
885 | MpegMuxContext *s = ctx->priv_data; |
||
886 | int i; |
||
887 | |||
888 | for(i=0;i |
||
889 | avio_w8(ctx->pb, 0); |
||
890 | |||
891 | s->vcd_padding_bytes_written += s->packet_size; |
||
892 | |||
893 | avio_flush(ctx->pb); |
||
894 | |||
895 | /* increasing the packet number is correct. The SCR of the following packs |
||
896 | is calculated from the packet_number and it has to include the padding |
||
897 | sector (it represents the sector index, not the MPEG pack index) |
||
898 | (see VCD standard p. IV-6)*/ |
||
899 | s->packet_number++; |
||
900 | } |
||
901 | |||
902 | static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){ |
||
903 | // MpegMuxContext *s = ctx->priv_data; |
||
904 | int i; |
||
905 | |||
906 | for(i=0; i |
||
907 | AVStream *st = ctx->streams[i]; |
||
908 | StreamInfo *stream = st->priv_data; |
||
909 | PacketDesc *pkt_desc; |
||
910 | |||
911 | while((pkt_desc= stream->predecode_packet) |
||
912 | && scr > pkt_desc->dts){ //FIXME > vs >= |
||
913 | if(stream->buffer_index < pkt_desc->size || |
||
914 | stream->predecode_packet == stream->premux_packet){ |
||
915 | av_log(ctx, AV_LOG_ERROR, |
||
916 | "buffer underflow st=%d bufi=%d size=%d\n", |
||
917 | i, stream->buffer_index, pkt_desc->size); |
||
918 | break; |
||
919 | } |
||
920 | stream->buffer_index -= pkt_desc->size; |
||
921 | |||
922 | stream->predecode_packet= pkt_desc->next; |
||
923 | av_freep(&pkt_desc); |
||
924 | } |
||
925 | } |
||
926 | |||
927 | return 0; |
||
928 | } |
||
929 | |||
930 | static int output_packet(AVFormatContext *ctx, int flush){ |
||
931 | MpegMuxContext *s = ctx->priv_data; |
||
932 | AVStream *st; |
||
933 | StreamInfo *stream; |
||
934 | int i, avail_space=0, es_size, trailer_size; |
||
935 | int best_i= -1; |
||
936 | int best_score= INT_MIN; |
||
937 | int ignore_constraints=0; |
||
938 | int64_t scr= s->last_scr; |
||
939 | PacketDesc *timestamp_packet; |
||
940 | const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE); |
||
941 | |||
942 | retry: |
||
943 | for(i=0; i |
||
944 | AVStream *st = ctx->streams[i]; |
||
945 | StreamInfo *stream = st->priv_data; |
||
946 | const int avail_data= av_fifo_size(stream->fifo); |
||
947 | const int space= stream->max_buffer_size - stream->buffer_index; |
||
948 | int rel_space= 1024LL*space / stream->max_buffer_size; |
||
949 | PacketDesc *next_pkt= stream->premux_packet; |
||
950 | |||
951 | /* for subtitle, a single PES packet must be generated, |
||
952 | so we flush after every single subtitle packet */ |
||
953 | if(s->packet_size > avail_data && !flush |
||
954 | && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE) |
||
955 | return 0; |
||
956 | if(avail_data==0) |
||
957 | continue; |
||
958 | av_assert0(avail_data>0); |
||
959 | |||
960 | if(space < s->packet_size && !ignore_constraints) |
||
961 | continue; |
||
962 | |||
963 | if(next_pkt && next_pkt->dts - scr > max_delay) |
||
964 | continue; |
||
965 | if ( stream->predecode_packet |
||
966 | && stream->predecode_packet->size > stream->buffer_index) |
||
967 | rel_space += 1<<28; |
||
968 | if(rel_space > best_score){ |
||
969 | best_score= rel_space; |
||
970 | best_i = i; |
||
971 | avail_space= space; |
||
972 | } |
||
973 | } |
||
974 | |||
975 | if(best_i < 0){ |
||
976 | int64_t best_dts= INT64_MAX; |
||
977 | |||
978 | for(i=0; i |
||
979 | AVStream *st = ctx->streams[i]; |
||
980 | StreamInfo *stream = st->priv_data; |
||
981 | PacketDesc *pkt_desc= stream->predecode_packet; |
||
982 | if(pkt_desc && pkt_desc->dts < best_dts) |
||
983 | best_dts= pkt_desc->dts; |
||
984 | } |
||
985 | |||
986 | av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n", |
||
987 | scr / 90000.0, best_dts / 90000.0); |
||
988 | if(best_dts == INT64_MAX) |
||
989 | return 0; |
||
990 | |||
991 | if(scr >= best_dts+1 && !ignore_constraints){ |
||
992 | av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n"); |
||
993 | ignore_constraints= 1; |
||
994 | } |
||
995 | scr= FFMAX(best_dts+1, scr); |
||
996 | if(remove_decoded_packets(ctx, scr) < 0) |
||
997 | return -1; |
||
998 | goto retry; |
||
999 | } |
||
1000 | |||
1001 | assert(best_i >= 0); |
||
1002 | |||
1003 | st = ctx->streams[best_i]; |
||
1004 | stream = st->priv_data; |
||
1005 | |||
1006 | assert(av_fifo_size(stream->fifo) > 0); |
||
1007 | |||
1008 | assert(avail_space >= s->packet_size || ignore_constraints); |
||
1009 | |||
1010 | timestamp_packet= stream->premux_packet; |
||
1011 | if(timestamp_packet->unwritten_size == timestamp_packet->size){ |
||
1012 | trailer_size= 0; |
||
1013 | }else{ |
||
1014 | trailer_size= timestamp_packet->unwritten_size; |
||
1015 | timestamp_packet= timestamp_packet->next; |
||
1016 | } |
||
1017 | |||
1018 | if(timestamp_packet){ |
||
1019 | av_dlog(ctx, "dts:%f pts:%f scr:%f stream:%d\n", |
||
1020 | timestamp_packet->dts / 90000.0, |
||
1021 | timestamp_packet->pts / 90000.0, |
||
1022 | scr / 90000.0, best_i); |
||
1023 | es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size); |
||
1024 | }else{ |
||
1025 | assert(av_fifo_size(stream->fifo) == trailer_size); |
||
1026 | es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size); |
||
1027 | } |
||
1028 | |||
1029 | if (s->is_vcd) { |
||
1030 | /* Write one or more padding sectors, if necessary, to reach |
||
1031 | the constant overall bitrate.*/ |
||
1032 | int vcd_pad_bytes; |
||
1033 | |||
1034 | while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here |
||
1035 | put_vcd_padding_sector(ctx); |
||
1036 | s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet |
||
1037 | } |
||
1038 | } |
||
1039 | |||
1040 | stream->buffer_index += es_size; |
||
1041 | s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet |
||
1042 | |||
1043 | while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){ |
||
1044 | es_size -= stream->premux_packet->unwritten_size; |
||
1045 | stream->premux_packet= stream->premux_packet->next; |
||
1046 | } |
||
1047 | if(es_size) |
||
1048 | stream->premux_packet->unwritten_size -= es_size; |
||
1049 | |||
1050 | if(remove_decoded_packets(ctx, s->last_scr) < 0) |
||
1051 | return -1; |
||
1052 | |||
1053 | return 1; |
||
1054 | } |
||
1055 | |||
1056 | static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt) |
||
1057 | { |
||
1058 | MpegMuxContext *s = ctx->priv_data; |
||
1059 | int stream_index= pkt->stream_index; |
||
1060 | int size= pkt->size; |
||
1061 | uint8_t *buf= pkt->data; |
||
1062 | AVStream *st = ctx->streams[stream_index]; |
||
1063 | StreamInfo *stream = st->priv_data; |
||
1064 | int64_t pts, dts; |
||
1065 | PacketDesc *pkt_desc; |
||
1066 | int preload; |
||
1067 | const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY); |
||
1068 | |||
1069 | preload = av_rescale(s->preload, 90000, AV_TIME_BASE); |
||
1070 | |||
1071 | pts= pkt->pts; |
||
1072 | dts= pkt->dts; |
||
1073 | |||
1074 | if (s->last_scr == AV_NOPTS_VALUE) { |
||
1075 | if (dts == AV_NOPTS_VALUE || (dts < preload && ctx->avoid_negative_ts) || s->is_dvd) { |
||
1076 | if (dts != AV_NOPTS_VALUE) |
||
1077 | s->preload += av_rescale(-dts, AV_TIME_BASE, 90000); |
||
1078 | s->last_scr = 0; |
||
1079 | } else { |
||
1080 | s->last_scr = dts - preload; |
||
1081 | s->preload = 0; |
||
1082 | } |
||
1083 | preload = av_rescale(s->preload, 90000, AV_TIME_BASE); |
||
1084 | av_log(ctx, AV_LOG_DEBUG, "First SCR: %"PRId64" First DTS: %"PRId64"\n", s->last_scr, dts + preload); |
||
1085 | } |
||
1086 | |||
1087 | if (dts != AV_NOPTS_VALUE) dts += preload; |
||
1088 | if (pts != AV_NOPTS_VALUE) pts += preload; |
||
1089 | |||
1090 | av_dlog(ctx, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", |
||
1091 | dts / 90000.0, pts / 90000.0, pkt->flags, |
||
1092 | pkt->stream_index, pts != AV_NOPTS_VALUE); |
||
1093 | if (!stream->premux_packet) |
||
1094 | stream->next_packet = &stream->premux_packet; |
||
1095 | *stream->next_packet= |
||
1096 | pkt_desc= av_mallocz(sizeof(PacketDesc)); |
||
1097 | pkt_desc->pts= pts; |
||
1098 | pkt_desc->dts= dts; |
||
1099 | pkt_desc->unwritten_size= |
||
1100 | pkt_desc->size= size; |
||
1101 | if(!stream->predecode_packet) |
||
1102 | stream->predecode_packet= pkt_desc; |
||
1103 | stream->next_packet= &pkt_desc->next; |
||
1104 | |||
1105 | if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0) |
||
1106 | return -1; |
||
1107 | |||
1108 | if (s->is_dvd){ |
||
1109 | if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder) |
||
1110 | stream->bytes_to_iframe = av_fifo_size(stream->fifo); |
||
1111 | stream->align_iframe = 1; |
||
1112 | stream->vobu_start_pts = pts; |
||
1113 | } |
||
1114 | } |
||
1115 | |||
1116 | av_fifo_generic_write(stream->fifo, buf, size, NULL); |
||
1117 | |||
1118 | for(;;){ |
||
1119 | int ret= output_packet(ctx, 0); |
||
1120 | if(ret<=0) |
||
1121 | return ret; |
||
1122 | } |
||
1123 | } |
||
1124 | |||
1125 | static int mpeg_mux_end(AVFormatContext *ctx) |
||
1126 | { |
||
1127 | // MpegMuxContext *s = ctx->priv_data; |
||
1128 | StreamInfo *stream; |
||
1129 | int i; |
||
1130 | |||
1131 | for(;;){ |
||
1132 | int ret= output_packet(ctx, 1); |
||
1133 | if(ret<0) |
||
1134 | return ret; |
||
1135 | else if(ret==0) |
||
1136 | break; |
||
1137 | } |
||
1138 | |||
1139 | /* End header according to MPEG1 systems standard. We do not write |
||
1140 | it as it is usually not needed by decoders and because it |
||
1141 | complicates MPEG stream concatenation. */ |
||
1142 | //avio_wb32(ctx->pb, ISO_11172_END_CODE); |
||
1143 | //avio_flush(ctx->pb); |
||
1144 | |||
1145 | for(i=0;i |
||
1146 | stream = ctx->streams[i]->priv_data; |
||
1147 | |||
1148 | assert(av_fifo_size(stream->fifo) == 0); |
||
1149 | av_fifo_free(stream->fifo); |
||
1150 | } |
||
1151 | return 0; |
||
1152 | } |
||
1153 | |||
1154 | #define OFFSET(x) offsetof(MpegMuxContext, x) |
||
1155 | #define E AV_OPT_FLAG_ENCODING_PARAM |
||
1156 | static const AVOption options[] = { |
||
1157 | { "muxrate", NULL, OFFSET(user_mux_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, ((1<<22) - 1) * (8 * 50), E }, |
||
1158 | { "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, {.i64 = 500000}, 0, INT_MAX, E}, |
||
1159 | { NULL }, |
||
1160 | }; |
||
1161 | |||
1162 | #define MPEGENC_CLASS(flavor)\ |
||
1163 | static const AVClass flavor ## _class = {\ |
||
1164 | .class_name = #flavor " muxer",\ |
||
1165 | .item_name = av_default_item_name,\ |
||
1166 | .version = LIBAVUTIL_VERSION_INT,\ |
||
1167 | .option = options,\ |
||
1168 | }; |
||
1169 | |||
1170 | #if CONFIG_MPEG1SYSTEM_MUXER |
||
1171 | MPEGENC_CLASS(mpeg) |
||
1172 | AVOutputFormat ff_mpeg1system_muxer = { |
||
1173 | .name = "mpeg", |
||
1174 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"), |
||
1175 | .mime_type = "video/mpeg", |
||
1176 | .extensions = "mpg,mpeg", |
||
1177 | .priv_data_size = sizeof(MpegMuxContext), |
||
1178 | .audio_codec = AV_CODEC_ID_MP2, |
||
1179 | .video_codec = AV_CODEC_ID_MPEG1VIDEO, |
||
1180 | .write_header = mpeg_mux_init, |
||
1181 | .write_packet = mpeg_mux_write_packet, |
||
1182 | .write_trailer = mpeg_mux_end, |
||
1183 | .priv_class = &mpeg_class, |
||
1184 | }; |
||
1185 | #endif |
||
1186 | #if CONFIG_MPEG1VCD_MUXER |
||
1187 | MPEGENC_CLASS(vcd) |
||
1188 | AVOutputFormat ff_mpeg1vcd_muxer = { |
||
1189 | .name = "vcd", |
||
1190 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"), |
||
1191 | .mime_type = "video/mpeg", |
||
1192 | .priv_data_size = sizeof(MpegMuxContext), |
||
1193 | .audio_codec = AV_CODEC_ID_MP2, |
||
1194 | .video_codec = AV_CODEC_ID_MPEG1VIDEO, |
||
1195 | .write_header = mpeg_mux_init, |
||
1196 | .write_packet = mpeg_mux_write_packet, |
||
1197 | .write_trailer = mpeg_mux_end, |
||
1198 | .priv_class = &vcd_class, |
||
1199 | }; |
||
1200 | #endif |
||
1201 | #if CONFIG_MPEG2VOB_MUXER |
||
1202 | MPEGENC_CLASS(vob) |
||
1203 | AVOutputFormat ff_mpeg2vob_muxer = { |
||
1204 | .name = "vob", |
||
1205 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"), |
||
1206 | .mime_type = "video/mpeg", |
||
1207 | .extensions = "vob", |
||
1208 | .priv_data_size = sizeof(MpegMuxContext), |
||
1209 | .audio_codec = AV_CODEC_ID_MP2, |
||
1210 | .video_codec = AV_CODEC_ID_MPEG2VIDEO, |
||
1211 | .write_header = mpeg_mux_init, |
||
1212 | .write_packet = mpeg_mux_write_packet, |
||
1213 | .write_trailer = mpeg_mux_end, |
||
1214 | .priv_class = &vob_class, |
||
1215 | }; |
||
1216 | #endif |
||
1217 | |||
1218 | /* Same as mpeg2vob_mux except that the pack size is 2324 */ |
||
1219 | #if CONFIG_MPEG2SVCD_MUXER |
||
1220 | MPEGENC_CLASS(svcd) |
||
1221 | AVOutputFormat ff_mpeg2svcd_muxer = { |
||
1222 | .name = "svcd", |
||
1223 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"), |
||
1224 | .mime_type = "video/mpeg", |
||
1225 | .extensions = "vob", |
||
1226 | .priv_data_size = sizeof(MpegMuxContext), |
||
1227 | .audio_codec = AV_CODEC_ID_MP2, |
||
1228 | .video_codec = AV_CODEC_ID_MPEG2VIDEO, |
||
1229 | .write_header = mpeg_mux_init, |
||
1230 | .write_packet = mpeg_mux_write_packet, |
||
1231 | .write_trailer = mpeg_mux_end, |
||
1232 | .priv_class = &svcd_class, |
||
1233 | }; |
||
1234 | #endif |
||
1235 | |||
1236 | /* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */ |
||
1237 | #if CONFIG_MPEG2DVD_MUXER |
||
1238 | MPEGENC_CLASS(dvd) |
||
1239 | AVOutputFormat ff_mpeg2dvd_muxer = { |
||
1240 | .name = "dvd", |
||
1241 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"), |
||
1242 | .mime_type = "video/mpeg", |
||
1243 | .extensions = "dvd", |
||
1244 | .priv_data_size = sizeof(MpegMuxContext), |
||
1245 | .audio_codec = AV_CODEC_ID_MP2, |
||
1246 | .video_codec = AV_CODEC_ID_MPEG2VIDEO, |
||
1247 | .write_header = mpeg_mux_init, |
||
1248 | .write_packet = mpeg_mux_write_packet, |
||
1249 | .write_trailer = mpeg_mux_end, |
||
1250 | .priv_class = &dvd_class, |
||
1251 | }; |
||
1252 | #endif22)><22)>0) |